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Net Loss Per Share - Schedule of Calculation of Net Loss Per Share (Details) ¥ / shares in Units, $ / shares in Units, ¥ in Thousands, $ in Thousands		12 Months Ended
		Dec. 31, 2019 CNY (¥) ¥ / shares shares	Dec. 31, 2019 USD ($) $ / shares shares	Dec. 31, 2018 CNY (¥) ¥ / shares shares	Dec. 31, 2017 CNY (¥) ¥ / shares shares
Net loss attributable to Sunlands Technology Group used in basic and diluted net loss per share:
Net loss attributable to ordinary shareholders		¥ (394,817)	$ (56,713)	¥ (927,022)	¥ (918,578)
Denominator:
Weighted average ordinary shares outstanding used in computing basic and diluted net loss per share	[1]	6,830,058	6,830,058	6,294,870	3,945,864
Net loss per share
Basic and diluted | (per share)		¥ (57.81)	$ (8.30)	¥ (147.27)	¥ (232.80)
[1] Each 25 American depositary shares ("ADSs") represents one of the Company's Class A ordinary shares.

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The amount of net income or loss for the period per each share in instances when basic and diluted earnings per share are the same amount and reported as a single line item on the face of the financial statements. Basic earnings per share is the amount of net income or loss for the period per each share of common stock or unit outstanding during the reporting period. Diluted earnings per share includes the amount of net income or loss for the period available to each share of common stock or common unit outstanding during the reporting period and to each share or unit that would have been outstanding assuming the issuance of common shares or units for all dilutive potential common shares or units outstanding during the reporting period.

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The portion of profit or loss for the period, net of income taxes, which is attributable to the parent.

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